﻿using System.Net;
using EU.Core.Common.Swagger;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;

namespace EU.Core.Extensions.Middlewares;

public class SwaggerAuthMiddleware
{

    private readonly RequestDelegate next;

    public SwaggerAuthMiddleware(RequestDelegate next)
    {
        this.next = next;
    }

    public async Task InvokeAsync(HttpContext context)
    {
        // 也可以根据是否是本地做判断 IsLocalRequest
        if (context.Request.Path.Value.ToLower().Contains("index.html"))
        {
            // 判断权限是否正确
            if (IsAuthorized(context))
            {
                await next.Invoke(context);
                return;
            }

            // 无权限，跳转swagger登录页
            context.RedirectSwaggerLogin();
        }
        else
        {
            await next.Invoke(context);
        }
    }

    public bool IsAuthorized(HttpContext context)
    {
        // 使用session模式
        // 可以使用其他的
        return context.IsSuccessSwagger();
    }

    /// <summary>
    /// 判断是不是本地访问
    /// 本地不用swagger拦截
    /// </summary>
    /// <param name="context"></param>
    /// <returns></returns>
    public bool IsLocalRequest(HttpContext context)
    {
        if (context.Connection.RemoteIpAddress == null && context.Connection.LocalIpAddress == null)
        {
            return true;
        }
        if (context.Connection.RemoteIpAddress.Equals(context.Connection.LocalIpAddress))
        {
            return true;
        }
        if (IPAddress.IsLoopback(context.Connection.RemoteIpAddress))
        {
            return true;
        }
        return false;
    }
}
public static class SwaggerAuthorizeExtensions
{
    public static IApplicationBuilder UseSwaggerAuthorized(this IApplicationBuilder builder)
    {
        return builder.UseMiddleware<SwaggerAuthMiddleware>();
    }
}
